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3D vertical seismic profile acquired with distributed acoustic sensing on tubing installation: A case study from the CO2CRC Otway Project

Journal Article · · Interpretation
 [1];  [1];  [1];  [1];  [2];  [2];  [2]
  1. Curtin Univ., Kensington (Australia)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
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Distributed acoustic sensing (DAS) can revolutionize the seismic industry by using fiber-optic cables installed permanently to acquire on-demand vertical seismic profile (VSP) data at fine spatial sampling. With this, DAS can solve some of the issues associated with conventional seismic sensors. Studies have successfully demonstrated the use of DAS on cemented fibers for monitoring applications; however, such applications on tubing-deployed fibers are relatively uncommon. Application of tubing-deployed fibers is especially useful for preexisting wells, where there is no opportunity to install a fiber behind the casing. In the CO2CRC Otway Project, we acquired a 3D DAS VSP using a standard fiber-optic cable installed on the production tubing of the injector well. We aim to analyze the quality of the 3D DAS VSP on tubing, as well as discuss lessons learned from the current DAS deployment. We find the limitations associated with the DAS on tubing, as well as ways to improve the quality of the data sets for future surveys at Otway. Due to the reduced coupling and the long fiber length (approximately 20 km), the raw DAS records indicate a high level of noise relative to the signal. Despite the limitations, the migrated 3D DAS VSP data recorded by cable installed on tubing are able to image interfaces beyond the injection depth. Furthermore, we determine that the signal-to-noise ratio might be improved by reducing the fiber length.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE), Clean Coal and Carbon (FE-20)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1580816
Journal Information:
Interpretation, Journal Name: Interpretation Journal Issue: 1 Vol. 7; ISSN 2324-8858
Publisher:
Society of Exploration GeophysicistsCopyright Statement
Country of Publication:
United States
Language:
English

References (27)

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4D surface seismic tracks small supercritical CO2 injection into the subsurface: CO2CRC Otway Project journal August 2017
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Field testing of modular borehole monitoring with simultaneous distributed acoustic sensing and geophone vertical seismic profiles at Citronelle, Alabama: Field testing of MBM journal November 2015
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Analysis of signal to noise and directivity characteristics of DAS VSP at near and far offsets — A CO2CRC Otway Project data example journal December 2017
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Distributed Acoustic Sensing Applied to 4D Seismic - Preliminary Results from the CO2CRC Otway Site Field Trials conference June 2017
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Related Subjects

3D
47 OTHER INSTRUMENTATION
fiber-optic sensors
vertical seismic profile